JP2008127245A - Substrate conditioning material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a substrate conditioning material which can suppress blisters and pinholes formed by a gas floated up from open pores of the base on the surface of a corrosion resistant lining, a surface coating or the like, provide good coating workability even at a low temperature of about 5°C without increasing a working load and provide high early strength, when a corrosion resistant lining, a surface coating or the like is applied to the base having open pores on the surface of a concrete structure or the like. <P>SOLUTION: The substrate conditioning material is composed of the following (A) and (B). (A) is inorganic particles with Blaine specific surface area of 2,500-12,000 cm<SP>2</SP>/g which contain particles substantially inert to water and an alumina cement. (B) is an organic admixture containing a water reducing agent and/or a thickener and a polymer, or the organic admixture and water. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a base material adjusting material for adjusting a coating state of a surface coating material or the like by interposing it between a concrete base and a surface coating material or the like when surface coating or the like is mainly performed on a concrete structure.

Concrete has a tendency to generate minute open pores (pinholes) on the surface of the hardened body due to bubbles floating on the surface from the inside after placement, water dispersion due to drying, and the like. For example, when a concrete structure is subjected to anticorrosion lining, surface coating, etc., if pinholes exist on the surface of the underlying concrete, the construction will gradually flow into the pinholes and the gas in the pinholes will rise. When local swelling occurs on the surface of the object or the gas penetrates the object to be coated, the portion remains on the surface of the object as a pinhole. For this reason, a surface conditioning material is applied on the base concrete by a plastering method, the pinhole is filled, the surface is smoothed, and anticorrosion lining and surface coating are performed. However, with a conventional substrate preparation material, it is difficult to obtain a smooth surface with a single application, so this is repeated many times, and if there is a swollen part, it can be applied to the surface. A very time-consuming and time-consuming method for adjusting the surface condition of an object has been performed. Epoxy-based putty materials have been used as such surface conditioning materials, but the coating workability is poor and expensive. In addition, polymer cement mortar using Portland cement or alumina cement is known as a typical substrate conditioner that improves the construction state of the finishing material with respect to the concrete substrate (see, for example, Patent Documents 1 to 3). However, polymer cement mortar alone is not suitable as a base material for suppressing pinholes and swelling. For this reason, it is also attempted to use a polymer cement mortar and a resin primer in combination with a substrate preparation material. For example, a substrate preparation material that combines an epoxy polymer cement mortar and a water-soluble epoxy resin primer is known. . (For example, refer to Patent Documents 4 to 5.) Since this type of base material is alternately coated with a resin primer and a polymer cement mortar, the construction work process is increased, which takes time. Moreover, when trying to construct such a material as a substrate preparation material at a low temperature of around 5 ° C., for example, the putty material and the epoxy resin primer are in a hard-to-deform lump state, and the workability is extremely reduced, and polymer cement The consistency of mortar decreases due to fluctuations in consistency. There are no known pinholes that can be easily used even in cold environments such as winter, and base material for suppressing swelling.
JP 2000-185957 A JP-A-4-132648 JP 2005-343663 A JP-A-7-197670 Japanese Patent Laid-Open No. 10-176424

  The present invention suppresses the occurrence of swelling and pinholes on the surface of an anticorrosion lining or surface coating when applying an anticorrosion lining or surface coating to a ground such as a concrete structure where pinholes exist. An object of the present invention is to provide a base material that does not increase the construction work load, has good application workability even at a low temperature of, for example, about 5 ° C., and has high adhesion strength.

  As a result of intensive studies for solving the above problems, the present inventor used an alumina cement-based composition composed of inorganic particles having a specific Blaine specific surface area and an organic admixture as a base material on which a pinhole exists. When applied, the base material enters the base pinhole easily and quickly, and easily replaces the gas in the base pinhole, and the replaced gas enters the interface between the base and base material and the base material. There is a self-smoothness that quickly passes through the base material without stagnation and breaks up easily on the surface, and the bubble breakage is immediately repaired by the surrounding base material, resulting in gas Acquired knowledge that traces of passing and foam breakage hardly remain on the substrate surface as dents and open pores, and the substrate preparation material does not require complicated and time-consuming processes, and is around 5 ° C. of Also the present invention has been completed from the fact that was excellent in workability smeared with warm.

That is, this invention is a base material adjusting material represented by the following (1)-(4). (1) A substrate material comprising the following (A) and (B). (A); inorganic particles having a Blaine specific surface area of 2500 to 12000 cm ² / g containing particles substantially inert to water and alumina cement; (B); containing a water reducing agent and / or thickener and a polymer. An organic admixture or an organic admixture and water. (2) The substrate preparation material according to (1), wherein the inorganic particles of (A) contain Portland cement. (3) The substrate preparation material according to (1) or (2), wherein the inorganic particles of (A) are inorganic particles having a particle content of Blaine specific surface area of 2500 to 6000 cm ² / g of 88% by mass or more. (4) The inorganic particles of (A) contain 12 to 30% by mass of particles having a Blaine specific surface area of 2500 to 4000 cm ² / g, and contain 66% by mass or more of particles having a Blaine specific surface area of 4000 to 6000 cm ² / g. The substrate preparation material according to any one of (1) to (3).

  According to the present invention, even when anticorrosion lining or surface coating is performed on a ground where pinholes such as concrete structures are likely to exist, surface conditions such as pinholes and blisters are hardly deteriorated on the surface of the coating. A smooth surface can be obtained, and construction for that purpose can be carried out easily and in a short period of time, for example, at room temperature as well as at a low temperature of around 5 ° C.

The inorganic particles constituting the substrate preparation material of the present invention include particles substantially inert to at least alumina cement and water. The alumina cement to be used may be any alumina cement, but preferably an alumina cement having a Blaine specific surface area of 2500 to 6000 cm ² / g because good workability is easily secured. By using alumina cement, the initial strength development is improved and the work period is shortened, and it also contributes to suppressing phenomena that lead to surface degradation such as dry cracking and acid erosion.

In addition, the water substantially inert to the water contained in the inorganic particles may not react at all with water at the construction temperature of the base material of the present invention or may be slightly reactive. As long as the particles are made of an inorganic substance that does not affect the effects of the invention, there is no particular limitation except that the particles have a Blaine specific surface area of 2500 to 12000 cm ² / g. Specific examples include natural or artificial aggregates such as those used in calcium carbonate, silica sand, and other general mortars. Among these, it is preferable to use calcium carbonate and / or silica sand because it is inexpensive in cost, a commercially available product with stable quality can be easily obtained, and mixing and dispersibility during production are good. In the case of using silica sand, for example, No. 8 silica sand satisfies the range of the Blaine specific surface area and is suitable because classification treatment or the like is not particularly required. In addition, although it does not restrict | limit especially as construction temperature of the base material of this invention, 5-40 degreeC is illustrated in general. The inclusion of such substantially inert particles in water makes it easy to obtain a workability suitable for application as a substrate preparation material, and the gas generated from the base pinhole does not stay in the middle of the substrate preparation material. It becomes easy to be released from. The content of particles substantially inert to water is preferably 15 to 57 parts by mass with respect to 100 parts by mass of the alumina cement. If it is less than 15 parts by mass, the coating workability is deteriorated, and if it exceeds 57 parts by mass, it is difficult to suppress the occurrence of swelling and pinholes during surface coating.

It is essential that the inorganic particles constituting the substrate-adjusting material of the present invention have a Blaine specific surface area of 2500 to 12000 cm ² / g. When the Blaine specific surface area is less than 2500 cm ² / g, the particle size is excessive, so that it is difficult for the base material to enter the base pinhole smoothly, and the workability related to the surface smoothness of the base material is reduced. This is not preferable. When the specific surface area of the branes exceeds 12000 cm ² / g, workability suitable for application is not obtained, replacement of the gas in the base pinhole with the base material becomes difficult to proceed, and residual gas is further removed. Since it becomes difficult to surface, it is not preferable. Preferably, the inorganic particles constituting the surface preparation material of the present invention is a Blaine specific surface area of 2500~12000cm ² / g, particle content of Blaine specific surface area 2500~6000cm ² / g is not less than 88 wt% The occurrence of swelling and pinholes can be further suppressed. More preferably, the particle content of the Blaine specific surface area is 2500 to 12000 cm ² / g, the Blane specific surface area is 2500 to 4000 cm ² / g, the particle content is 12 to 30% by mass, and the Blaine specific surface area is 4000 to 6000 cm ² / g. The amount of inorganic particles is 66% by mass or more. By setting the particle content of such Blaine specific surface area, the replacement of the gas in the base pinhole and the base material adjuster more smoothly, in addition to being able to further suppress the occurrence of swelling and pinholes, The painting workability is also improved.

The inorganic particles constituting the substrate-adjusting material of the present invention may contain inorganic particles having a Blaine specific surface area of 2500 to 12000 cm ² / g other than the particles substantially inactive to the water as long as the effects of the present invention are not lost. good. Specifically, various slags such as blast furnace slag within the range of the Blaine specific surface area, ore, silica fume, fly ash, metakaolin, Portland cement, gypsum and the like can be exemplified. Among these, inclusion of Portland cement is preferable from the viewpoint of acceleration of curing. Any type of Portland cement may be used, and examples thereof include normal, early strength, ultra-early strength, and moderate heat. As for content in the case of containing Portland cement, 6-21 mass parts is preferable with respect to 100 mass parts of alumina cement. If the amount is less than 6 parts by mass, the inclusion effect is hardly obtained. On the other hand, if the content exceeds 21 parts by mass, it is difficult to suppress the occurrence of swelling and pinholes during surface coating, which is not appropriate. Further, it is preferable to contain metakaolin because it is easy to obtain a product particularly suitable for application. The content in the case of containing metakaolin is preferably 2 to 15 parts by mass with respect to 100 parts by mass of Portland cement. If it is less than 2 parts by mass, almost no inclusion effect is obtained. Moreover, workability may fall in content exceeding 15 mass parts.

  Moreover, the substrate conditioner of the present invention comprises an organic admixture containing a water reducing agent and / or a thickener and a polymer in addition to the inorganic particles, or the organic admixture. The water reducing agent and the thickener may be used either alone or in combination. Preferably a water reducing agent is used. The water reducing agent may be any material that can be used in mortar or concrete. For example, a high water reducing agent, an AE water reducing agent, a high performance AE water reducing agent, a fluidizing agent, and a dispersing agent may be used. What is called can be used. Examples of the component include those having naphthalene sulfonic acid, melamine sulfonic acid, lignin sulfonic acid, or polycarboxylic acid as active ingredients. Of these, naphthalenesulfonic acid-based water reducing agents are preferred. By including the water reducing agent, workability suitable for the application work can be obtained, and the base material can easily enter the concrete base pinhole, and traces due to gas passage and bubble breakage hardly remain on the base material. As for content in the case of using a water reducing agent independently, 1-2.3 mass parts is preferable with respect to 100 mass parts of alumina cements. If the amount is less than 1 part by mass, the pot life is too short and the workability is limited. On the other hand, if the amount exceeds 2.3 parts by mass, the curing may be delayed.

  Moreover, the thickener used for the base material of this invention will not be specifically limited if it can be used for mortar and concrete, For example, various cellulose type thickeners can be mentioned. Containing workability suitable for painting work is obtained by the inclusion of the thickener, and contributes to improving the adhesion of the work. As for content in the case of using a thickener independently, 0.15-0.5 mass part is preferable with respect to 100 mass parts of alumina cements. When the construction is less than 0.15 parts by mass, a fragile layer may be easily formed on the surface layer part. On the other hand, when the amount exceeds 0.5 parts by mass, the viscosity is excessively increased, and workability may be deteriorated. When the organic admixture contains a water reducing agent and a thickener in combination, the content of the water reducing agent is the preferred content when used alone, and the thickener is the preferred when used alone. Although it is recommended that the content is approximately half of the content, it is not limited to this recommended value.

  The polymer contained in the organic admixture is not particularly limited as long as it can be used for mortar and concrete. As such a polymer, for example, a polymer dispersion defined in JIS A 6203, a re-emulsified powder resin defined in JIS A 6203, or the like can be used. Specific examples of the polymer dispersion include an epoxy resin, polyacrylic acid ester, styrene butadiene, ethylene vinyl acetate, or the like as an active ingredient, and the re-emulsified powder resin includes a polyacrylic acid ester or a styrene acrylic copolymer. Examples thereof include powder resins containing ethylene vinyl acetate, vinyl acetate / vinyl versatate, vinyl acetate / vinyl versatate / acrylic acid ester, and the like as active ingredients. By containing a polymer, the action of suppressing water dispersion in the substrate conditioner and improving the adhesion to the ground concrete works. The content of the polymer is preferably 2 to 20 parts by mass in terms of solid content with respect to 100 parts by mass of the alumina cement. If it is less than 2 parts by mass, the inclusion effect is hardly seen, and if it exceeds 20 parts by mass, the consistency becomes too small and the workability is lowered, swelling and dents are likely to remain, and cracks are also generated. Because there is, it is not appropriate.

  Moreover, the organic admixture used for the substrate preparation material of the present invention may contain an organic admixture other than the water reducing agent and polymer as long as the effects of the present invention are not lost. Examples of such admixtures include water retention agents, antifoaming agents, shrinkage reducing materials and the like, all of which can be used for mortar and concrete.

  In addition, the substrate preparation material of the present invention may contain water. In particular, when a re-emulsified powder resin is used, it is necessary to add water in order to re-emulsify it. The amount of water added is preferably about 30 to 115 parts by mass with respect to 100 parts by mass of alumina cement. If the re-emulsified powder resin is used if it is less than 30 parts by mass, the workability may be deteriorated, so it is not appropriate, and if it exceeds 115 parts by mass, it is difficult to obtain a decrease in adhesion strength to the concrete surface and surface smoothness. Not appropriate.

  Moreover, the manufacturing method of the base material of this invention is not specifically limited, It can manufacture with the method substantially the same as general cementitious mortar. For example, inorganic particles and organic admixture as described above may be added to a commercially available mortar mixer, and water may be added as needed, and kneaded. Moreover, although the construction method to the base concrete of the base material adjustment material of this invention is suitable, it is not limited to this, You may construct with another construction method.

  EXAMPLES Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited to the examples shown here.

  <Preparation of substrate preparation material> Materials and water selected from C to H2 shown below and water (added water; using tap water) are put into a mixing container so as to have the blending amount shown in Table 1, and the temperature is about 20 Using a hand mixer in an environment of 80 ° C. and humidity of 80%, the mixture was kneaded for 1 minute at a rotation speed of 1000 rpm to prepare a base material (Invention product 1-13, Reference product 21-26).

C: Alumina cement (Brain specific surface area 5130 cm ² / g, manufactured by Taiheiyo Materials Co., Ltd.)
D1: Calcium carbonate powder (adjusted to a Blaine specific surface area of 3000 cm ² / g, adjusted by Hitachi Kansui Stone Co., Ltd.)
D2: No. 8 silica sand (Blaine specific surface area 2800 cm ² / g)
D3: No. 7 silica sand (Brain specific surface area <2500 cm ² / g, maximum particle size 0.3 mm)
E1: Blast furnace slag powder having a brain specific surface area of 4000 cm ² / g.
E2: Blast furnace slag powder with a specific surface area of 8000 cm ² / g E3; Fly ash (specific surface area of 4800 cm ² / g)
E4: Silica fume (Blaine specific surface area 20 m ² / g)
E5: Normal Portland cement (Blaine specific surface area 3290 cm ² / g, Taiheiyo Cement Co., Ltd.)
E6: Metakaolin (Blaine specific surface area 10500 cm ² / g)
F: Naphthalene sulfonic acid-based high-performance water reducing agent (trade name “Mighty 100”, manufactured by Kao Corporation)
G: Hydroxypropyl methylcellulose (trade name “90SH-4000”, manufactured by Shin-Etsu Chemical Co., Ltd.)
H1: Water-based epoxy resin emulsion (trade name “NCL-UC-A”, manufactured by Nagase Chemtech Co., Ltd.)
H2: Acrylic styrene-based re-emulsified powder resin (trade name “TITAN8100”, manufactured by NSC Japan)

  The following evaluation / test was performed on the prepared base material. The results are summarized in Table 2.

  <Evaluation of Application Workability at Normal Temperature> A 40 × 100 × 8 cm concrete flat plate was placed vertically on the ground with one surface of 8 × 100 cm as the bottom surface. In a room adjusted to a temperature of 20 ° C., apply the above-mentioned substrate preparation material with a gold trowel on one side of 40 × 100 cm, which was confirmed to have about 50 pinholes on the flat plate installed by visual observation. I attached. It was judged that the substrate preparation material could be applied to the entire surface of the surface without resistance in less than 5 minutes, and that the substrate preparation material did not substantially adhere to the gold trowel after application was judged to be “good”. Those that were not in the situation were judged to be “bad”.

  <Evaluation of low-temperature coating workability> A 40 × 100 × 8 cm concrete flat plate was placed vertically on the ground with one surface of 8 × 100 cm as the bottom. In a room adjusted to a temperature of 5 ° C., apply the above-mentioned substrate preparation material with a gold trowel on one side of 40 × 100 cm, which was confirmed to have about 50 pinholes on the flat plate installed by visual observation. I attached. It was judged that the substrate preparation material could be applied to the entire surface of the surface without resistance in less than 5 minutes, and that the substrate preparation material did not substantially adhere to the gold trowel after application was judged to be “good”. Those that were not in the situation were judged to be “bad”.

  <Evaluation of the surface state of the construction> Construction of the base material at each temperature described above, the number of surface bulges was examined with the naked eye and tentacles immediately after the completion of painting, and the construction was further allowed to elapse for 60 minutes at the same temperature. The number of pinholes on the surface of the object was examined with the naked eye. The results are also shown in Table 2.

  <Adhesion strength test> In a room where the temperature is kept at 5 ° C and 20 ° C and humidity of 80%, press the prepared substrate preparation material on a 30x30cm surface of a 30x30x6cm flat concrete plate with a gold trowel. Spread and paint. This was placed horizontally in a room where the humidity was changed to 60% at the same temperature as when it was applied, and curing was carried out. A 4 × 4 cm steel attachment was affixed with a commercially available epoxy resin adhesive to the coated surface cured at 2 days and 4 days of age using a Kenken-type adhesive strength tester, and the adhesion strength was measured.

  From Table 2, the substrate preparation material of the present invention has good coating workability at 5 ° C. and 20 ° C., and also has high early adhesion strength, and bloating and pinholes are generated compared to the reference products that are out of the present invention. It can be seen that is significantly lower.

Claims (4)

A substrate material comprising the following (A) and (B). (A); inorganic particles having a Blaine specific surface area of 2500 to 12000 cm ² / g containing particles substantially inert to water and alumina cement; (B); containing a water reducing agent and / or thickener and a polymer. An organic admixture or an organic admixture and water. The base material of Claim 1 in which the inorganic particle of (A) contains Portland cement. The substrate preparation material according to claim 1 or 2, wherein the inorganic particles (A) contain 88% by mass or more of inorganic particles having a brain specific surface area of 2500 to 6000 cm ² / g. The inorganic particles (A) contain 12 to 30% by mass of particles having a Blaine specific surface area of 2500 to 4000 cm ² / g, and contain 66% by mass or more of particles having a Blaine specific surface area of 4000 to 6000 cm ² / g. The substrate conditioner according to any one of? 3.